when we breath in ,the oxygen we take diffusses with blood but what happens when we do not breath in and the heart still pump blood for purificationto lungs?

when we breath in ,the oxygen we take diffusses with blood but what ha

1.	when we breath in ,the oxygen we take diffusses with blood but what happens when we do not breath in and the heart still pump blood for purificationto lungs?
Answer» when we breath in ,the oxygen we take diffusses with blood but what happens when we do not breath in and the heart still pump blood for purificationto lungs?